Nissan Cube. Manual — part 976
TM-160
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F08B]
P1778 STEP MOTOR
P1778 STEP MOTOR
Description
INFOID:0000000009949038
• Step motor changes step by turning 4 coils ON or OFF according to signal from TCM.
• By changing step, step motor controls outward flow and inward flow of line pressure to primary pulley, deter-
mines the primary pulley position, and controls gear ratio.
• This DTC is not caused by an electrical malfunction (circuit open or short) but is caused by a mechanical
malfunction (control valve clogging, solenoid valve sticking, and others).
DTC Logic
INFOID:0000000009949039
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
CAUTION:
• Always drive vehicle at a safe speed.
• Before starting “DTC confirmation procedure”, check primary pulley speed and vehicle speed.
• It is fixed in high speed range. Go to
1.
PRECONDITIONING
Immediately after performing any “DTC CONFIRMATION PROCEDURE”, always turn ignition switch OFF.
Then wait at least 10 seconds before performing the next test.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1.
Select “Data Monitor” in “TRANSMISSION”.
2.
Select “RANGE”, “ATF TEMP SEN”, “ACC PEDAL OPEN”, “PRI SPEED” and “VEHICLE SPEED”.
3.
Drive the vehicle.
4.
Maintain the following conditions for 5 seconds or more.
5.
Stop the vehicle.
6.
Select “Self Diagnostic Results” in “TRANSMISSION”.
With GST
Follow the procedure “With CONSULT”.
Is “P1778” detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009949040
1.
CHECK STEP MOTOR SYSTEM
Check step motor system. Refer to
.
Is the inspection result normal?
YES
>> GO TO 2.
DTC
Trouble diagnosis name
DTC is detected if...
Possible cause
P1778
Step Motor Circuit Intermittent
TCM detects that primary speed sensor value and primary
pulley speed estimated from secondary speed sensor are
in a deviated state, and target pulley ratio and actual pul-
ley ratio are in a deviated state
Step motor
RANGE
: D
ATF TEMP SEN
: 2.03 – 0.16 V
ACC PEDAL OPEN
: More than 1.0/8
PRI SPEED
: More than 1,000 rpm
VEHICLE SPEED
: More than 10 km/h (7 MPH)
P1778 STEP MOTOR
TM-161
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F08B]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
NO
>> Repair or replace damaged parts.
2.
CHECK PRIMARY SPEED SENSOR SYSTEM
Check primary speed sensor system. Refer to
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace damaged parts.
3.
CHECK SECONDARY SPEED SENSOR SYSTEM
Check secondary speed sensor system. Refer to
.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace damaged parts.
4.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace transaxle assembly. Refer to
NO
>> Repair or replace damaged parts.
TM-162
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F08B]
OVERDRIVE CONTROL SWITCH
OVERDRIVE CONTROL SWITCH
Description
INFOID:0000000009949041
• The overdrive control switch is installed to the selector lever knob.
• When turning ON the overdrive control switch (OD OFF indicator lamp turns ON), the driving condition
becomes overdrive OFF.
• When turning OFF the overdrive control switch (OD OFF indicator lamp turns OFF), the driving condition
changes to “D” position.
Component Function Check
INFOID:0000000009949042
1.
CHECK OVERDRIVE CONTROL SWITCH SIGNAL
With CONSULT
1.
Turn ignition switch ON.
2.
Select “Data Monitor” in “TRANSMISSION”.
3.
Select “SPORT MODE SW”.
4.
Check display of “SPORT MODE SW”.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000009949043
1.
CHECK OVERDRIVE CONTROL SWITCH POWER CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect CVT shift selector connector.
3.
Turn ignition switch ON.
4.
Check voltage between CVT shift selector vehicle side harness connector terminals.
With intelligent key system
Without intelligent key system
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> GO TO 3.
2.
CHECK OVERDRIVE CONTROL SWITCH
Check overdrive control switch. Refer to
TM-164, "Component Inspection (Overdrive Control Switch)"
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-40, "Intermittent Incident"
.
NO
>> Repair or replace damaged parts.
3.
CHECK GROUND CIRCUIT
Monitor item
Condition
Status
SPORT MODE SW
Press and hold overdrive control switch
On
Other conditions
Off
CVT shift selector vehicle side harness connector
Condition
Voltage (Approx.)
Connector
Terminal
M58
1
2
Ignition switch: ON
5 V
Ignition switch: OFF
0 V
CVT shift selector vehicle side harness connector
Condition
Voltage (Approx.)
Connector
Terminal
M57
1
2
Ignition switch: ON
5 V
Ignition switch: OFF
0 V
OVERDRIVE CONTROL SWITCH
TM-163
< DTC/CIRCUIT DIAGNOSIS >
[CVT: RE0F08B]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
1.
Turn ignition switch OFF.
2.
Check continuity between CVT shift selector vehicle side harness connector terminal and ground.
With intelligent key system
Without intelligent key system
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace damaged parts.
4.
CHECK HARNESS BETWEEN CVT SHIFT SELECTOR (OVERDRIVE CONTROL SWITCH) AND COM-
BINATION METER (PART 1)
1.
Disconnect combination meter connector.
2.
Check continuity between CVT shift selector vehicle side harness connector terminal and combination
meter vehicle side harness connector terminal.
With intelligent key system
Without intelligent key system
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace damaged parts.
5.
CHECK HARNESS BETWEEN CVT SHIFT SELECTOR (OVERDRIVE CONTROL SWITCH) AND COMBI-
NATION METER (PART 2)
Check continuity between CVT shift selector vehicle side harness connector terminal and ground.
With intelligent key system
Without intelligent key system
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace damaged parts.
6.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Check input and output signals of combination meter. Refer to
NO
>> Repair or replace damaged parts.
CVT shift selector vehicle side harness connector
Ground
Continuity
Connector
Terminal
M58
2
Existed
CVT shift selector vehicle side harness connector
Ground
Continuity
Connector
Terminal
M57
2
Existed
CVT shift selector vehicle side harness connector
Combination meter vehicle side harness connector
Continuity
Connector
Terminal
Connector
Terminal
M58
1
M34
8
Existed
CVT shift selector vehicle side harness connector
Combination meter vehicle side harness connector
Continuity
Connector
Terminal
Connector
Terminal
M57
1
M34
8
Existed
CVT shift selector vehicle side harness connector
Ground
Continuity
Connector
Terminal
M58
1
Not existed
CVT shift selector vehicle side harness connector
Ground
Continuity
Connector
Terminal
M57
1
Not existed
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